三种新型复合材料修补大鼠腹壁缺损的研究

目的观察三种新型国产复合补片修补腹壁缺损的效果,客观评价三种补片的防粘连效果。方法 Wistar大鼠120只,采用完全随机方法随机分为4组:①聚丙烯(PP)+聚丙交己内酯(PLC)组;②PP+透明质酸(HA)/PLC组;③PP+胶原/PLC组;④PP+膨体聚四氟乙烯(e-PTFE)组,每组30只。切除直径约1cm的大鼠全层腹壁,以直径1.5cm的补片进行修补,分别于术后30、60、90及180d处死,每次处死5只,根据Nair评分标准进行粘连评分,并进行组织学检查。结果术后各组大鼠均未出现死亡,在各时间点均出现腹腔粘连,主要为网膜、肠管。术后各时间点,PP+胶原/PLC组粘连评分均低于PP+e-PTFE组(P<0.05)。PP+HA/PLC组和PP+PLC组粘连评分与PP+e-PTFE组相比差异无统计学意义(P>0.05)。组织学检查显示,术后各时间点,各组补片周围均有炎性细胞浸润和成纤维细胞出现及胶原分泌,随时间推移炎症细胞逐渐减少,成纤维细胞逐渐增多,胶原分泌增多。术后30d胶原及HA层消失,PLC层出现断裂,在术后180dPLC层尚未被完全吸收,在4种补片腹腔面均有细胞或组织覆盖,将补片与腹腔内容物隔离,胶原/PLC复合补片的隔离层的连续性最好。结论 PLC、HA/PLC和胶原/PLC三种国产复合补片在动物实验中均具有良好的防粘连效果,其中胶原/PLC复合补片的防粘连效果最佳,且价格低廉,适于大众普遍使用,临床应用前景良好。     

载有纳米银新型复合补片在污染条件下大鼠腹壁缺损修补中的运用

目的观察载有纳米银新型复合补片在污染条件下对大鼠腹壁缺损修补的应用效果,对其耐受感染和防粘连效果进行评价,进而探讨新型补片在感染条件下腹壁缺损一期修复中应用的可行性。方法成年雄性SD大鼠60只,体重200~280 g,随机分为普通聚丙烯补片组(A组)和新型纳米银复合补片组(B组),制备污染条件下大鼠腹壁缺损模型(缺损面积2 cm×2 cm),分别使用以上两种补片完成一期修复,术后对比观察两组大鼠一般情况及伤口愈合情况,术后30 d处死大鼠观察腹腔脏器粘连情况,同时切取补片及其周围组织进行病理学观察。结果术后30 d内共4只大鼠死亡,其中A组3只,B组1只,死亡原因与补片修补无关。切口愈合情况B组优于A组(P0.05),术后30 d二组均见腹腔脏器与补片粘连,主要为肠管、网膜,B组轻于A组,按照修正的Katada粘连评分方法,差异有统计学意义(P0.05);组织学观察,术后30 d,光镜下聚丙烯补片组依然有大量炎细胞浸润,可见毛细血管生长,成纤维细胞开始大量增生,胶原分泌增多,局部肉芽组织形成。新型纳米银复合补片组创面可见少量炎细胞浸润,成纤维细胞增生,胶原纤维和毛细血管大量增多,肉芽组织结构致密,成熟度高。结论新型纳米银复合补片在污染条件下腹壁缺损的一期修复中,具有更好的耐受感染、抗腹腔粘连特性,具有较好的临床应用前景,但其远期效果及生物安全性尚需进一步研究和评价。     

纳米仿生防粘连复合补片修复大鼠腹壁缺损中胶原合成功能的研究

目的评估纳米仿生、防粘连复合型疝补片修复腹壁疝的胶原蛋白合成功能的优劣,为临床提供实验依据。 方法选择成年SD雄性大鼠90只,随机分为3组：纳米仿生、防粘连复合型疝补片（nano-bionic and anti-adhesive compound hernia patch,NT）组,聚丙烯补片（polypropylene patch,PP）组及聚酯补片（polyester patch,PE）组,构建腹壁疝模型。根据分组将大小约3 cm× 2 cm的3组补片缝合于腹壁缺损处。术后观察大鼠一般情况,分别于术后4、6、8周处死大鼠各10只,大体观察腹腹壁手术区域胶原组织形成情况;剪取补片及其周围组织进行组织学观察,分析胶原蛋白表达情况,并进行Western bolt分析各组腹壁修复区域Ⅰ型胶原蛋白及Ⅲ型胶原蛋白表达量。 结果各组大鼠术后一般情况均良好,未出现死亡等不良事件;腹壁手术区域,NT组触感柔软,异物感较少,未见明显腹腔脏器突出,纤维组织生长情况良好;PP组触感较僵硬,皮下可见大量新生血管长入,异物感较重,纤维组织生长情况一般;PE组大鼠腹壁修复区触感僵硬,皮下可见较多新生血管长入,纤维组织生长较好。组织学观察：术后各个时间点,NT组修补效果优于PP、PE组,NT组Ⅰ型胶原表达更多,Ⅲ胶原表达更少,比例更加合理,纤维结构更加成熟稳定。组织蛋白含量：随着时间推移,术后各组Ⅰ型胶原蛋白随着时间进展逐步增加,而且NT组在各个时间点明显高于PP组及PE组,差异有统计学意义;术后6周及术后8周NT组的Ⅰ/Ⅲ型胶原蛋白比例基本保持在4∶1左右,较术后4周明显增加,而且在各个时间点上NT组均高于PP、PE组,差异有统计学意义。 结论在常规腹壁缺损无张力修补术过程中,NT补片在组织重构过程中比PP及PE补片更早形成成熟稳定的纤维结构,提供更加稳固的修复效果,适用于目前常规的腹壁疝修补,尤其是巨大腹壁缺损引起的腹壁疝。     

防粘连细菌纤维素复合补片动物模型的建立及实验研究

目的将防粘连细菌纤维素复合补片应用于大鼠实验中,进一步探索并验证该补片腹腔内的防粘连效果,为新型补片的研发提供理论基础。方法采用随机数字表法将48只成年Wistar大鼠平均分成2组(每组24例),分别为聚丙烯组(PP组)、防粘连复合补片组(PP/BC组)。每组再随机平均分成2个亚组(每组12例),即短期组(10 d)和长期组(60 d),分别予植入后10 d和60 d肉眼观察补片粘连情况,并取补片及其周围腹壁组织进行组织学观察,比较及评价各组补片的抗粘连效果。结果术后第10天,细菌纤维素复合补片防粘连评分明显优于聚丙烯补片(P0.05)。复合补片周围新生细胞外沉积较多(P0.05),腹腔侧有更明显的纤维结缔组织覆盖,较少的炎细胞浸润(P0.05)。术后第60天,细菌纤维素复合补片粘连评分与聚丙烯补片相比,差异无统计学意义(P0.05),炎细胞浸润较多、多核巨细胞浸润较少(P0.05)。结论细菌纤维素复合补片腹腔内修补的防粘连效果较佳,是一种潜在的腹腔内防粘连疝补片,但能否临床转化仍需进一步研究。     

脱细胞基质补片修复大鼠腹壁缺损时耐受感染能力的实验研究

目的探讨脱细胞异体真皮基质组织补片在污染或感染环境下一期修补大鼠腹壁缺损时耐受感染的能力。方法 60只SD雄性大鼠,随机分为清洁(A组)、污染(B组)、感染组(C组)3组,每组20只,另设空白对照组1只,采用切除全部腹壁肌肉的方式制备腹壁缺损模型,清洁组直接用补片修复缺损;用大肠稀释液涂抹补片、腹壁切口制备污染模型,后一期修补缺损;大肠纵向切开0.3 cm形成肠瘘制备感染模型,然后以脱细胞基质补片一期修复腹壁缺损。术后7 d、14 d各组分别处死一半大鼠,观察切口愈合情况、补片感染情况并取补片及周围组织进行病理检查。结果 A组、B组实验大鼠均无死亡,C组术后1周内死亡4只,均因肠瘘导致弥漫性腹膜炎,腹腔大量积液死亡。术后7 d污染、感染组切口感染率显著高于清洁组(P=0.004);术后14 d各组切口愈合情况差异无统计学意义。组织学观察显示术后7 d污染组炎性反应明显较清洁、污染组严重,而在纤维增生、新生血管形成等方面差异无统计学意义。结论从耐受感染的角度考虑,脱细胞异体真皮基质组织补片可用于一期修补污染或感染状态下腹壁缺损,该补片具有较强的耐受感染能力,其内在机制可能与炎性细胞容易进入补片及早期新生血管形成有关。     

国产新型防粘连复合补片与进口同类产品在腹外疝腹腔内修补术中的对比研究

目的：对比应用国产善释防粘连复合疝修补片与同类进口产品在腹外疝及腹壁缺损患者中行腹腔内的修补手术,探讨善释防粘连复合补片在腹外疝及腹壁缺损治疗中的应用价值。方法采用前瞻性随机分组对照研究,将符合条件的患者分为二组,试验组使用善释防粘连复合补片,对照组使用进口同类补片,每组各25例患者。记录二组患者手术前后的临床参数及术后各种并发症的发生例数,通过超声检查,记录术后7d及术后3个月补片下内脏移动距离,对疝修补片的防粘连性能做出客观评估,并对数据进行统计学分析。结果对二组的近期疗效、手术前后临床参数和术后并发症发生情况等方面进行统计学对比分析,二组患者在手术时间、术后住院日数、近期疗效、手术前后临床参数、术后补片下内脏移动距离和术后并发症发生情况等方面差异均无统计学意义。结论善释防粘连复合补片是一种安全、可靠的腹外疝及腹壁缺损腹腔内修补的国产新型材料。     

部分可吸收腹壁疝修补材料的研究

目的 对聚丙烯网（polypropylene mesh，PPM）＋壳聚糖膜部分可吸收复合材料修补大鼠腹壁缺损的效果进行研究。方法 S-D大鼠80只，随机分为单纯PPM修补组（Ⅰ组），PPM＋壳聚糖膜复合材料修补组（Ⅱ组）和商品化防粘连复合补片组（Ⅲ组）。手术造成腹壁缺损，分别采用上述三种补片修补，术后分期进行腹腔内粘连评分，组织学检查及抗张强度的测定。结果 Ⅰ组大鼠术后各期腹腔粘连明显高于Ⅱ组及Ⅲ组（分别P〈0．05），而Ⅱ组及Ⅲ组之间差异无统计学意义（P〉0．05）。电镜下，术后90d观察，Ⅰ组网片表面新腹膜的生长不规则，Ⅱ组网片表面有光滑、完整的新腹膜间皮细胞形成，Ⅲ组网片表面则没有新腹膜形成，而是形成纤维素性包裹层。术后60、90d，三组网片修复腹壁缺损后的抗拉强度差异无统计学意义（P〉0．05）。结论 本研究中利用PPM与壳聚糖膜这两种廉价材料组合后设计的部分可吸收复合网片，可安全放置腹腔，能有效的防止术后的粘连，并维持良好的修复强度，值得进一步研究和开发。     

孕晚期宫内修补胎羊腹壁缺损的初步实验研究

目的探讨孕晚期行宫内手术修补胎羊腹壁缺损的可行性。方法取8只孕110～115 d的健康山羊,体重14～22 kg,随机分为两组,分别为可吸收缝线组(A组,3只)及生物型补片组(B组,5只)。两组首先切除胎羊全层腹壁分别制备大小约5 cm×1 cm及5 cm×2 cm的腹壁缺损模型后,分别采用可吸收缝线缝合及两层生物型补片修补腹壁缺损。观察术后母羊及出生后小羊一般情况;于出生后第10天处死小羊观察腹腔内粘连情况,并取切口瘢痕组织行生物力学测定和组织学观察。结果术后共3只母羊流产,其中A组1只,B组2只;其余母羊均顺利娩出小羊。A组小羊腹壁切口愈合好,瘢痕呈线形,腹腔内粘连轻;瘢痕厚度为4～5 mm。B组小羊腹壁切口均未完全愈合,腹腔内粘连轻;瘢痕厚度为3～4 mm。生物力学测定A组瘢痕组织皮条断裂力为16、20 N,B组为10、14、18 N。组织学观察示,A组瘢痕组织范围小;B组见皮肤溃疡面和其下的纤维结缔组织,伴炎性细胞浸润。结论 孕晚期行宫内手术修补胎羊腹壁缺损可行;对于腹壁缺损较小者可直接缝合修补,缺损较大者可采用生物型补片修补。     

腹壁肿瘤切除术后遗留腹壁巨大缺损39例修复与重建

目的探讨采用聚丙烯（Polypropylene,PP）补片或复合补片修复腹壁肿瘤切除术后遗留腹壁巨大缺损的方法和效果。方法收治的39例腹壁巨大肿瘤患者均采取了手术切除治疗。采用直接缝合腹膜关闭腹腔,并在腹膜外用PP补片修复缺损6例,采用带蒂大网膜加PP补片修复缺损19例,采用复合补片修补腹壁缺损14例。结果 39例中因术后发生急性心肌梗塞死亡1例。术后肺部感染1例,经抗感染治疗治愈。术后出现皮下积液5例,经穿刺抽吸,理疗和引流等措施治愈。随访34例,随访时间1～5年。在访的4例结肠癌患者和4例胃癌患者术后12～27个月均因肿瘤腹腔内复发及肝脏广泛转移死亡,术后肿瘤局部复发1例,随访的全部患者未发生腹壁切口疝和肠梗阻等并发症。结论采用PP补片或复合补片修复腹壁肿瘤切除后遗留腹壁巨大缺损并发症发生率低,效果良好。     

丝素蛋白降低聚丙烯补片表面粘连的研究

目的 观察聚丙烯补片经丝素蛋白涂覆后,其表面粘连程度的变化,并探讨其作用机制.方法 将40只Sprague-Dawle大鼠随机分为两组,每组各20只.按组于腹腔内分别植入丝素蛋白涂覆聚丙烯材料(丝素面朝向腹腔,聚丙烯面朝向腹壁)和聚丙烯补片,于术后3、7、14、90 d分批处死大鼠,比较植入补片表面粘连程度及粘连面积,并行病理及扫描电镜检查.结果 丝素蛋白涂覆聚丙烯材料组,术后3、7、14、90d检查基本无腹腔内粘连形成,补片表面粘连面积占总面积的(6.04±4.78)%,粘连程度为(0.8±0.4);单纯聚丙烯组全部大鼠术后并发腹腔内粘连面积占总面积的(86.61±12.25)%,粘连程度为(3.4±0.6),有5只(5/20,25.0%)大鼠分别于术后2～9d因肠管与聚丙烯粘连引起肠梗阻或肠瘘死亡,两组的术后腹腔内粘连面积和粘连程度差异均存在统计学意义(P均<0.05).结论 丝素材料能促进腹膜间皮细胞长入,于聚丙烯补片表面腹膜化,形成新的间皮细胞层,可有效降低聚丙烯补片与腹腔内器官发生粘连的程度及范围.     

Evaluation of sepramesh biosurgical composite in a rabbit hernia repair model

BACKGROUND: In cases such as incisional hernia repair, polypropylene mesh (PPM) can be exposed to the underlying viscera and cause adhesions to the mesh. In this study, a composite prosthesis that was designed to be less susceptible to adhesion formation than PPM was evaluated in a rabbit incisional hernia repair model. MATERIALS AND METHODS: A 5 x 7-cm full-thickness defect was created in the abdominal wall of 30 female New Zealand White rabbits. Ten animals each were repaired with PPM, Bard Composix (PP/ePTFE), or Sepramesh biosurgical composite-a polypropylene mesh coated on one side with chemically modified sodium hyaluronate and carboxymethylcellulose (HA/CMC). The animals were sacrificed after 28 days and the overall performance, including adhesion formation and tissue integration by histology and mechanical testing, was evaluated. RESULTS: In the Sepramesh group, there was a significant reduction in the percentage of surface area covered by adhesions and a significant increase in the percentage of animals with no adhesions compared to standard materials. The tissue integration strength and overall cellular response were similar in all groups. A partially remesothelialized peritoneal surface was often apparent overlying the Sepramesh implant. CONCLUSIONS: Sepramesh biosurgical composite effectively repaired abdominal wall defects in rabbits and reduced adhesion development to the mesh compared to the use of a PPM and a PP/ePTFE composite.     

Experimental study of Composix mesh for ventral hernia

We aimed to compare conventional single-layer mesh and composite mesh in terms of the degree of tissue repair on the abdominal wall side of the mesh and the degree of mechanical adhesion to the intestine and to confirm the stability of composite mesh. We used a single-layer polypropylene (PP) mesh and a two-layer Composix mesh (E/X type) consisting of a PP mesh and an expanded polytetrafluoroethylene mesh. Twenty rats were divided into two groups. Three months after mesh placement, histopathologically, ingrowth of granulation tissue into the mesh on the abdominal wall side was prominent without mesh shrinkage or shift in either group. In the PP mesh group, 50% of the rats had firm adhesions between the mesh and the intestine, whereas the Composix mesh group had no adhesions to the intestine. Unlike conventional PP mesh, Composix mesh prevented adhesions to the intestine on the peritoneal side without impairing tissue union with the visceral peritoneum, suggesting its usefulness in clinical onlay mesh repair for ventral defects.     

Potential of Fortified Fibrin/Hyaluronic Acid Composite Gel as a Cell Delivery Vehicle for Chondrocytes

Numerous treatment methods have been applied for use in cartilage repair, including abrasion, drilling, and microfracture. Although chondrocyte transplantation is the preferred treatment, it has some shortcomings, such as difficulty of application (large and posterior condylar regions), poor chondrocyte distribution, and potential cell leakage from the defect region. The cell delivery system of the tissue engineering technique can be used to overcome these shortcomings. We chose fibrin/hyaluronan (HA) composite gel as an effective cell delivery system to resolve these issues. Both components are derived from natural extracellular matrix. In the first trial, fortified fibrin/HA composite gels with rabbit chondrocytes were tested by implantation in nude mice. At 4 weeks, glycosaminoglycan contents in the fibrin/HA composite (0.186 ±  0.006 mg/mg) were significantly higher than those in the presence of fibrin alone (0.153 ± 0.017 mg/mg). As a next step, we applied the fibrin/HA composite gel to animal cartilage defects using full thickness cartilage defect rabbit models. The fibrin/HA composite gel with rabbit chondrocytes (allogenic) was implanted into the experimental group, and the control group was implanted with the fibrin/HA composite gel alone. Implanted chondrocytes with the fibrin/HA composite showed improved cartilage formation. In conclusion, the key to successful regeneration of cartilage is to provide the repair site with a sufficient supply of chondrogenic cells with a suitable delivery vehicle to ensure maximal differentiation and deposition of the proper extracellular matrix. This study suggests the feasibility of tissue-engineered cartilage formation using fibrin/HA composite gel.     

Prevention of adhesion to prosthetic mesh in incisional ventral hernias: comparison of different barriers in an experimental model

BACKGROUND: The purpose of this study was to compare the intra-abdominal adhesion formation following ventral hernia repair by using oxidized regenerated cellulose (ORC) as a barrier underneath polypropylene mesh (PPM), and sodium hyaluronate/carboxymethylcellulose (HA/CMC)-coated PPM. METHODS: A ventral abdominal defect was created in each of 30 male rats which were divided into three groups. In group 1 (control) the defect was repaired with PPM; in group 2 ORC was laid over the viscera and the defect was repaired with PPM, and in group 3 HA/CMC-coated PPM was used for the repairing procedure. On the 28th postoperative day all the rats were sacrificed and adhesions were evaluated by laparoscopic exploration followed by histopathological examination. RESULTS: Animals treated with ORC and PPM, and HA/CMC-coated PPM showed significantly less adhesions than the control group (p = 0.026) and the intra-abdominal adhesions of the rats in these two groups were significantly easier to release than in the control group (p = 0.001). There was no significant difference between the ORC and HA/CMC groups. CONCLUSIONS: ORC used together with PPM is as effective as HA/CMC-coated PPM and ORC can be used as an adhesion barrier in intra-abdominal hernia repair.     

Preparation and degradation characteristic study of bone repair composite of DL—polylactic acid／hydroxyapatite／decalcifying bone matrix

Objective:To explore the preparative method and study the degradation characteristics of bone repair composite of DL-polyactic acid(PDLLA) /hydroxyapatite(HA)/decalcifying bone matrix(DBM) in vitro.Methods:An emulsion blend method was developed to prepare the composite of PDLLA/HA/DBM in weight ratio of PDLLA:HA:DBM=1.2-2:1.5:1.The dynamic changes of weight,biomechanical property and pH value of PDLLA/HA/DBM and PDLLA in phosphate buffered saline(PBS,pH7.4)were studied respectively through degradation tests in vitro.Results:Without being heated,PDLLA,HA and DBM could be synthesized with the emulsion blend method as bone composite of PDLLA/HA/DBM,wich had both osteoconductive and osteoinductive effects.The diameter of the aperture was 100-400μm and the gap rate was 71.3%.During degradation,the pH value of PDLLA solution decreased lightly within 2 weeks,but decreased obviously at the end of 4 weeks and the value was 4.0 .While the pH value of PDLLA/HA/DBM kept quite steady and was 6.4 at the end of 12 weeks.The weight of PDLLA changed little within 4 weeks,then changed obviously and was 50% of its initial weight at the end of 12 weeks.While the weight of PDLLA/HA/DBM changed little within 5 weeks ,then changed obviously and was 60% of the initial weight at the end of 12 weeks.The initial biomechanical strength of PDLLA was 1.33 MPa, decreased little within 3 weeks, then changed obviously and kept at 0.11 MPa at the end of 12 weeks.The initial biomechanical strength of PDLLA/HA/DBM was 1.7 MPa, decreased little within 4 weeks, then changed obviously and kept at 0.21 MPa at the end of 12 weeks.Conclusions:The emulsion blend method is a new method to prepare bone repair materials.As a new bone repair material,PDLLA/HA/DBM is more suitable for regeneration and cell implantation,and the environment during its degradation is advantageous to the growth of bone cells.     

Adhesion formation and reherniation differ between meshes used for abdominal wall reconstruction

Incisional hernia is a common surgical problem, frequently requiring prosthetic mesh repair. The demands of the ideal mesh seem conflicting; ingrowth at the mesh–fascia interface, without development of adhesions at the visceral mesh surface. Various antiadhesives combined with macroporous mesh and composite meshes were studied for prevention of adhesions to mesh and ingrowth into the fascia. In 60 rats an abdominal wall defect was created and repaired with underlay mesh. Rats were divided into six groups and treated with polypropylene mesh (PPM, control), PPM with auto-cross-linked polymers (ACP) gel, PPM with fibrinogen glue (FG), polypropylene/expanded polytetrafluoroethylene (ePTFE) mesh, polypropylene/sodium hyaluronate/carboxymethylcellulose (HA/CMC) mesh, and polypropylene-collagen/polyethylene-glycol/glycerol (CPGG) mesh. Mesh infection was assessed in the postoperative period, adhesions and reherniations were scored at sacrifice 2 months after operation, and tensile strength of the mesh–tissue interface was measured. Six rats developed mesh infection, half of them were treated with PPM/ePTFE. The PPM/HA/CMC group showed a significant reduction in the amount and severity of adhesions. In animals treated with PPM/ACP and PPM/FG, severity of adhesions was reduced as well. Reherniation rate in the PPM/ACP group was 50% and significantly higher than that in other groups. Rats in the PPM/HA/CMC had the highest tensile strength. PPM/HA/CMC approaches the demands of the ideal mesh best, having superior antiadhesive properties, no reherniation and no infection in this rat model of incisional hernia.     

消旋聚乳酸/羟基磷灰石/脱钙骨基质的制备及其体外降解特性研究

目的：探讨消旋聚乳酸／羟基磷灰石／脱钙骨基质（PDLLA／HA／DBM）R的制备方法及其体外降解特性。方法：按重量比PDLLA：HA：DBM＝1．5－2．1－1．5：1，应用乳液共混法，制备PDLLA／HA／DBM生物复合材料，通过体外降解实验，观察其在磷酸盐缓冲液（PBS，PH7．4）中重量，生物力学及PH值的动态变化，结果：采用乳液共混法，不需加温，可将PDLLA、HA、DBM一次性复合,制成生物复合材料PDLLA／HA／DBM。孔隙率为71．3％；扫描电镜显示复合材料孔径为100－400μm；降解过程中；PDLLA溶液的PH值2周内轻度下降，而后明显下降，4周时PH值为4．0；PDLLA／HA／DBM溶液的PH值在12周的降解过程中十分稳定，12周时PH值为6．4。PDLLA重量在0－4周时变化较小，4周后下降加快，12周时为初始重量的50％； 量在0－5周时变化比较小，5周后下降加快，12周时为初始重量的60％。PDLLA的初始抗压强度为1．33MP a，PDLLA／HA／DBM的初始抗压强度为1．71MPa，两者有统计学意义（P＜0．05）；PDLLA强度在0－3周下降较小，3周后下降较快，12周仅0．11Mpa；PDLLA／HA／DBM强度在0－4周下降较小，4周后下降较快，12周时为0．21 Mpa；。结论：乳液共混法是制备骨修复材料的新方法，PDLLA／HA／DBM作为一种新型治疗骨缺损的材料，具有良好的孔隙率及降解特性。     

Hyaluronic acid/carboxymethylcellulose membrane barrier versus taurolidine for the prevention of adhesions to polypropylene mesh

BACKGROUND: A hyaluronic acid/carboxymethylcellulose (HA/CMC) membrane is an effective measure to prevent polypropylene mesh induced adhesions. We hypothesized that taurolidine 2% solution might be a cost-effective alternative to decrease adhesion formation. MATERIALS AND METHODS: Twenty-four rats were randomized into three groups: mesh alone (group 1), mesh + taurolidine 2% (group 2), and mesh + HA/CMC (group 3). Polypropylene mesh (4 cm2) was used to repair surgically induced anterior abdominal wall defects. Taurolidine 2%or a HA/CMC membrane was used as an antiadhesive measure. The animals were sacrificed 6 weeks after the operation, and adhesions to the prosthetic material were evaluated with digital image analysis. RESULTS: Group 1 (mesh alone) had the highest adhesion ratio (58.5 +/- 4.8%) compared with groups 2 and 3 (p < 0.05). The differences between groups 2 (mesh + taurolidine 2%; adhesion ratio 42.9 +/- 1.6%) and 3 (mesh + HA/CMC; adhesion ratio 40.3 +/- 3.0%) were not significant (p > 0.05). CONCLUSIONS: The animals of both treatment groups (2 and 3) had lower adhesion ratios compared with the controls (group 1). In particular, the HA/CMC membrane did not present with a superior antiadhesive effect compared with taurolidine. Therefore, taurolidine is a cost-effective alternative to HA/CMC membranes when a polypropylene mesh is used in direct contact with the abdominal viscera.